I am completely new to burning DVDs. I am trying to burn a powerpoint project to play on a standalone DVD player. I am using Burn and have successfully burned the file to a DVD-R. However, when I try to play it on a DVD player (I've tried 2 different ones) it says that it is unreadable. What am I doing wrong????

When the finished DVD (the one you burnt) is inside your Mac's optical disk drive (ODD), can you access it via Finder and see a VIDEO_TS folder with VOB, IFO and BUP files in it? Can you play that DVD via VLC Player or even DVD Player?